OK so this stuff is not cheap, but..... because you only need a little it actually turns out to be cheaper - go figure.
And does it work? I purchased the 325 ml to test, and when it ran out I RAN back for the 1250 ml bottle, which REALLY drives the price down, making this a no brainer.
On a different not altogether:
Because I ran out unexpected and I needed this product in a MAJOR hurry, I shot of an email to customer service asking to give this priority - as a courtesy. Their response was almost instantaneous, and the shipping speed was nothing short of lightning fast.
So if you're in a pinch, call or email these guys, they WILL take care of you. Their customer care is A+!